Athscl nonaut bio bypass of the left leg w ulcer of calf

This code signifies the presence of atherosclerosis affecting a non-native biological bypass graft located in the left leg, specifically complicated by ulceration on the calf. This indicates a late-stage complication of peripheral artery disease where a previously implanted biological graft has become diseased, leading to tissue breakdown.

Use this code when documentation confirms atherosclerotic changes within a biological bypass graft (e.g., saphenous vein graft from a cadaver) in the left leg, accompanied by an open wound or ulcer on the calf. This typically applies to patients with chronic limb ischemia who have undergone bypass surgery using a non-autologous biological conduit.

• Ensure documentation clearly specifies "nonautologous biological" graft to differentiate from autologous or synthetic grafts.
• Verify the ulceration is located on the calf and not another part of the left leg.
• Assign additional codes for the type of ulcer (e.g., pressure, stasis) if specified, and any associated infections.